thefishdaddy said:you can add one of those wind driven spinning vents on the roof, keep all the lights off and turn it on late @ night or just keep one light for you to see the fish, and just add a lot of air stone in the tank, that is what i do when summer comes and sometimes it gets 90 deg. on the top rack and a lot cooler near the floor so all the fry goes up there and the the fish that are less tolerant to low DO goes on the bottom unless your tank is in a system, if you are running a blower or central air move it outside and then just move it back in when winter comes, dont feed to much coz the wasted food will compete for oxygen during nitrification or do the swamp cooler or just insulate the garage door and windows and let cool air in at night and close the door and the cool air stays inside longer and it also helps save energy if ever you decide to install a small airconditioner in it, when winter comes you can just flip the wall mounted air and heat up the room.D